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S UNITED STATES DEPARTMENT of the INTERIOR \s UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY GEOLOGY OF THE DEEP CREEK AREA, WASHINGTON, AND ITS REGIONAL SIGNIFICANCE By Robert G. Yates Open-file report 76-537 ~~ 1976 This report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards. ERRATA for Geology of the Deep Creek Area, Washington, and its regional significance by Robert G. Yates U.S. Geol. Survey Open File Report 76-537 1. The readers attention is called to the fact that the table of contents does not show proper rank of many headings. 2. Page 13, line 18 and 19: "the connotation of" should be followed by "a clay content refers to the original sediment. Collectively rocks" of this group ........ 3. Page 27, line 13: Delete sentence "The ..... appendix." 4. Page 43, heading: "Rocks below the thrust fault" and "Gypsy quartzite" are main and subheadings rather than a single heading. 5. Page 45, heading: "Rocks above the thrust fault" and "Maitlen Phyllite" are main and subheadings rather than a single heading. 6. Page 117, line 17: "bent" omitted before "albite lamellae." 7. Page 160: Delete 1st paragraph as a repeat of paragraph on previous page. 8. Page 239, line 17: change ", and those" to "were." . 9. Page 295: Add heading above 3rd paragraph and in table of contents: "The Lime Creek Mountain block and the decollement problem." 10. Page 302, Next to last sentence: Should read imreasonable rather than reasonable. 11. Page 4G2, line 6: add "can be assumed to have been" continuous. 12. Page 404, line 8: Should read "p. 83), of Kootenay Lake (Crosby, 1968, p. 72), and of the panhandle of Idaho. It requires no" 13. Page 422, last line: change "its" to "ifs." Contents Page Stratigraphy and structure of the Deep Creek area 1 Introduction 1 Field work and acknowledgements 5 General relations 8 Stratigraphy 11 Introductory statement 11 Hooknose-Baldy block 16 Gypsy Quartzite 17 Maitlen Phyllite 21 Metaline Formation 26 Age*" " --- u_». ..-. __. _.« ...___ __. TT- .,.- _________ 3 j Ledbetter 41 Lime Creek Mountain block 43 Rocks below the thrust fault Gypsy Quartzite 43 Maitlen Phyllite 44 Rocks above the thrust fault Maitlen Phyllite 45 Metaline Formation 46 The Ledbetter Slate 48 Devonian argillite unit-r 50 Red Top-Grass Mountain block 53 Red Top Mountain assemblage 53 Page S tratigraphy continued Maitlen Phyllite and Metaline Formation 57 Argillite Red Top 61 The Glass Mountain sequence 62 Pend dT Oreille block 69 Rossland Group 76 Nor thpor t block 7 7 Rocks south of the Spirit pluton 78 Precambrian and Cambrian rocks of the lone Hill and Huckleberry Mountain area 79 Cambrian and Ordovician rocks of the Magma mine area 84 Cambrian rocks of the north slope of Mount Rogers 85 Gypsy Quartzite 86 Maitlen Phyllite 87 Metaline Formation 87 Cambrian rocks of the Sierra Zinc mine area 88 Introduction 91 Hooknose-Baldy block 98 Lime Creek Mountain block - 103 Red Top-Grass Mountain block 108 Pend d T Oreille block 116 Area south of the Spirit pluton 118 Faults that bound the blocks 121 Black Canyon fault 126 ii Page X US Precambrian rocks of the Belt-Purcell anticlinorium and the lr*^*\ 4» j>^^% Q^T *^ *^ ^ -- - - - ------ - - - _ - .._.-_ , _ . _^ -_._._.. , _ _ £VWW UCllCtjf Gil. C. « - ,. ., .«.. ........ MI. .1,. ..!,.. ...... .. Priest River Group 144 Belt-Purcell depositional environment 151 TJ-?W JLilkJlC TtH Ql^mQT*^ JL UiCJL C T*r%/**l^I. L/L.IXO g . MIMIT .«-. n i .. u^ ...*.,,!.....- ,,1... M .,i. «.ii..._ in T._ ........ ._.....-in JA _.._ ._ i JL^ J^ OA The Shedroof Conglomerate 158 Problems on the correlation of conglomerates 176 oUDQlVjLS jLOnS~*~ """' " " "' """ " "*" " i"" 1~ " " """ j «» _ mi j- ««^-"ij. " iinii Hi. inn j > >. mi - .1. ... General lithology and regional variation 190 Cambrian phyllites Maitlen and Laib Formations 200 Stratigraphic relations 200 General lithology and regional variation 202 Reeves Limestone Member 202 Phyllite Member (Upper Laib) 205 iii Page Regional setting continued The rocks continued Carbonate Stratigraphic relations 210 General lithology, subdivision, and regional variation 213 Black shale facies of the Paleozoic 224 Ledbetter Slate and argillite A 225 Argillite B 232 Rocks of the Pacific Borderland 237 Rocks transitional to the eugeosynclinal facies 238 Flagstaff Mountain sequence 241 Rocks of the eugeosynclinal facies 245 Mount Roberts Formation 245 Hr-cft-ULUL.I. AY_x- »...uu " _ , J ~ .. ^ j-i--,,^ 1~ ___«« .«.-!-«. -..._._..__.-_ ! r-r_i _,.>______^_-.^_._»._.»^__^,.,,.._. - ____ _____. _ . _____ ...^m..- _ ___________ -, -. £(+9AQ -y Rossland Group 250 Post-Rossland limestones 253 Sophie 1 Mountain Formation 253 Volcanic and sedimentary rocks of the Cenozoic 260 Belshazzar Mountain area 269 Grouse Mountain area 270 iv Page Regional setting continued Regionaj. structure ""*"*"*""""" -' " - -- -- ' -^- - - - - --- -- -" "» n.omocJ.j.ne Qg^^- - ------- -«--------- " _.U_L . j.ne r oJLcL jjgjLt ~ " ~ r " "- - -- --- - Hooknose-Baldy block 289 Columbia anticline in British Columbia 308 Columbia anticline in Washington 311 Brodie-Sullivan Kink fold 316 Jurassic volcanic belt 318 Sequence of events and interpretation of regional geology 320 Events and problems of the Precambrian 323 Windermere time 331 Precambrian structure 343 Events and problems of the Cambrian 344 Diachrony and the sand facies 345 Carbonate facies 352 Black shale facies of the Ordovician, Silurian, and Devonian 356 The Mississippian and the problem of a mid-Paleozoic orogeny 358 Conglomerates and their significance 360 Mid-Paleozoic orogeny 367 Late Page Sequence of events and interpretation of regional geology continued The Mesozoic, the Orogenic Era 381 Time and intensity of folding 383 The Kootenay arc as a foldbelt 388 Kink folds and the basement structure 393 Uplift and erosion, the end of an era 399 Sophie Mountain conglomerate 399 Plutonism and the subduction model 401 The Cenozoic and extension tectonics 415 S*4U.XL.CU +* n 1-1 . .... .1 .- __ .. _n __ »__i_ __ u_ T mnm. __ ___. 7 . H-OT -in. __ ._ nn .11 ., r- __ ^______ ________-uj^.^i.__-u. __ -yj^m . __ _ . __ i,..,.«.._ . i . .__ T i .1 -»" vi Illustrations [Figures 2, 3, 5A, 9, 14, 14B, 19A, 25, 37A and 39 are separate] Page Figure 1. Index map showing location of the Deep Creek area 2 2. Geologic map of the Deep Creek area 7 3. Diagram of stratigraphic sections of Cambrian rocks in northeastern Washington and adjacent British Columbia 18 4. Chart showing equivalence of stratigraphic map symbols 29 5. Photographs of rocks in intraformational breccia unit, Metaline Formation 32 5A. Map of the structural geology of the Deep Creek area 96 6. Sketch map showing location of the axis of the Hooknose 7. Sketch showing structural relations at southeast end of Lime Creek Mountain block 105 7A. Geologic map and section of the Deep Creek mine area 106a 8. Geologic cross section of Lime Creek Mountain block south of Black Canyon 109 9. Geologic map and cross sections of the Red Top Mountain- 10. (There is no figure 10) 11. Diagrammatic sketch maps indicating hypothetical movement pattern of the Leadpoint fault 124 12. Sketch showing trace of Black Canyon and Russian Creek 12A. Sketch showing interpreted relations between Lime Creek Mountain and Red Top-Grass Mountain blocks 131 vii Page Figure 13. Photomicrograph of cataclastic black argillite 133 14. Geologic map of part of northeastern Washington and adjacent British Columbia 136 14A. Index map showing sources from which the geologic map (Fig. 14) was compiled. 14B. Index to structural features shown on geologic map (Fig. 14). 15. Index map showing location of Kootenay arc, Belt-Purcell Anticlinorium, and Pacific Borderland 138 15A. Correlative stratigraphic names commonly referred to in this ^»A**L. C££S w*.^+* 4»L. _ ____ __ _ _ __ __ _ _ _ _ __ - - » .,.«..,-.- -_ i-._.__.-_ __- __- ^_ . - .. .-____.___-.-..,._ . - -_ _ .^^- 1 / jO 16. Map showing outcrop limits of the Belt Supergroup and Purcell Series 152 16A. Geologic map of Windennere conglomerates and volcanic rocks near the International boundary 177 17. Map showing distribution of Windennere conglomerates 179 18. Sketch showing relations between Windermere and other -rr\r*\rcL. (Jl»^O ________ _______ _____________________________________ -i.ii.ii-i . ..__ w-, _____.. .-. ____ J.o*+1 flA 19. Paleogeologic map of Precambrian rocks 185 19A. Chart showing age and location of graptolite collections from Stevens and Pend Oreille Counties, Washington 216 20. Map showing distribution of Sophie Mountain Formation 254 20A. Chemical analyses of the San Poil volcanics and related formations in northeastern Washington and triangular diagram showing chemical relations 268 21. Index map showing structural subdivisions of the regional geologic map 274 22. Sketches showing development of the Pass Creek fault zone 279 23. Photomicrograph and photograph of deformed Shedroof 24. Map showing structural setting of the Russian Creek viii Page Figure 25. Geologic cross sections showing development of structure in 26. Alternate interpretation of the prefold thrust fault 306 27. Diagram showing trace of axis of the Columbia anticline 313 28. Map showing pattern of fold trends in Kootenay arc and Pacific Border province 317 29. Chart showing condensed geologic history of northeastern Washington and adjacent Idaho and British Columbia 321 30. Relation of depth to metamorphism 326 31. Isopach maps of Belt-Purcell rocks 330 32. Sketch showing relations between Precambrian and basal 33. Distribution pattern of the Windermere volcanic and intru- sive roclcS"" ""~"~^T~ ._!. «« « « « . _________ , _________ 34. Distribution map of Belt Supergroup and equivalent rocks 338 35. Alkali-silica diagram comparing Windermere basalts with oceanic basaJLts """""" ~* " ~~ - "-- *,_ -r.r-M.-im , _^._____ 36. Cross section showing eastward thinning of the Cambrian 36A. Isopach map of Cambrian sands shale facies 351 37.
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